You might want to consider using Android Studio instead of the older Eclipse Android IDE. I've had a much easier time getting things like AVDs and the SDK manager working with Android Studio. Just a thought.
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Ian LantzyJul 25 at 16:33

4 Answers
4

The correct SDK and tools are not installed. For this you need to go to the location where you have downloaded Android-SDK and start the android.sh. Then download required platform/build tools along with required files for any API.

SDK tool is not getting execution rights. To solve this problem, navigate to the SDK location directory and type the following in your terminal.(as root if necessary).chmod -R +x Android-SDK
Replacing Android-SDK with the name of your SDK directory.

Note : Android is shutting down its project for eclipse support, so I suggest migrating to Android Studio as soon as possible. Check here for details.

Important: Support for the Android Developer Tools (ADT) in Eclipse is ending, per our announcement. You should migrate your app development projects to Android Studio as soon as possible. For more information on transitioning to Android Studio, see Migrating to Android Studio.